Grinder for coffee-mills.



PATENTED APR. 30, 1907.

W. J. BUSSINGIIR. GRINDER FUR COFFEE MILLS.`

APPLICATION FILED OCT. 2-1, 1905.

2 SHEETS-SHEET 1.

R. E G N I S s U B J. W

@BINDER PoR COFFEE MILLS.

APPLICATION IILBD 00T.21. 1905.

2 SHEETS-SHEET 2.

@mmm

UNITED STATES PATENT OFFTUB.

TO NATIONAL SPECIAUY MANUFACTURING COMPANY, OF PHILADEL- PHIA, PENNSYLVANIA, A Finn.

GRINDER FOR COFFEE-MILLS.

Speeication of Letters Patent.'

'ratenteol April 30, 1907.

Application led October 21,1905. Serial No. 283,771.

To all whom, t may concern.-

Be it known that I, ViLLIAu J. BssiN- GER, a citizen of the United States, residing in the city and county of Philadelphia, State of Pennsylvania, have invented a new and useful Grinder for Coffee-Mills, of which the following is a specification.

My invention relates to grinding mills in which the grinding plates are of the form of 1o an annulus or ring and consists of a novel construction and arrangement of the dress of the rings whereby the guiding and grinding elements are very durable and reduce the material in a very reliable and accurate manner to the desired state of fneness.

It further consists in providing a dress whereby clogging of the material in the grinder is prevented and a free discharge of the material results.

of construction, all as will be hereinafter fully set forth.

Figure l represents a plan view of a grinding plate embodying my invention. Fig. 2

z 5 represents a sectional view on line Fig.

- l. Fig. 3 represents a side elevation, showing a portion of two plates in assembled position. Fig. 4 represents, on an enlarged scale, a plan view of a portion of a grinding 3o plate. Fig. 5 represents a full quadrant of a grinder on an enlarged scale.

Similar numerals of reference indicate corresponding parts in the figures.

Referring to the drawings: l designates a 3 5 grinding ring provided with a central opening 2. The ring is provided with an inclined surface A, a surface B angular-ly disposed with respect to the surface A, and a raised surface O. The face of the ring is provided 4o with a dress, the detailed construction and arrangement of which is as follows:-

3 designates a series of ribs or drifts, arranged at substantially equal distances apart, their inner ends being substantially vertical so as to make projections standing squarely out over the inclined surface A from the lower edge of which said drifts begin. They then extend spirally outward on the surfaces B and extend on the surface 5o C so as to form a reverse curve as seen at 4L in Figs. l and 5.

5 designates a series of drifts about midway between the drifts 3 and similar thereto,

It further consists of other novel features i but instead of beginning at the lower edge of the inclined face A they begin at the inner edge of the plane surface B extending spirally outward therefrom to the outer edge of the surface O so as to form a reverse curve.

6 designates a series of shorter drifts which are arranged on the surface O in the spaces formed between the drifts 3 and 5 and have their cutting edge parallel to the cutting edges formed by the reverse curve of the drifts 3 and 5. The inner end of each drift 6 is tapered or has an inclined face extending downwardly and vanishing in the surface B. The cutting edge of that portion of each drift which extends on the surface O has a substantially vertical face 7, the opposite faces of each drift being beveled or inclined and the top face forming a plane surface so that each drift forms a tooth-shaped grinding element.

9 designates a groove or depression between the drifts, said groove beginning a short distance lrom the outer periphery of the ring, then extending inwardly and inclining downwardly and vanishing into the surface B. These grooves are widest near their center and taper gradually toward their ends. It will be apparent that the thickness of the ring between the teeth will be greater near the outer periphery, than the thickness between the teeth on the surface B or that portion of the surface O in which the depressions 9 are located. I have found by practical experiment that in using grinding plates provided with the dress thus far described, the grain is sometimes fed too rapidly to insure proper grinding or to obtain the desired result. In order to avoid this, I interpose on the surface B intermediate the drifts 3 and 5, a stop l0 only one of which is numbered in Figs. l and 2 which in the present instance consists of a triangular shaped lug arranged so that one of its vertices is on a radial line. The upper face of all the drifts 3 form gathering points.

The operation is as follows: These rings, having their working faces dressed alike, are

.used in pairs, sometimes having one stationary and sometimes having both revolving, in which latter case they would revolve in opposite directions. It will be seen that the space between the drifts extending from the surface A to the periphery of the ring gradually increases in thickness, so that the thick- IOO - through which the grain passes also gradu- 'SAO stops 10,as well as the depressions 9.

ally decreases.` This will cause the grain to be gradually crushed and facilitate the subsequent reduction as the grain is carried outwardly toward the grinding teeth. The amount of grain which is permitted to feed between the drifts is accurately limited or regulated by means of the stops 10, so that the quantity of grain which each grinding element reduces is substantiallyy the same amount which regulation, as is evident, will greatly Aincrease the efhciency of the grinding plates. It is to be noted that the upper face of the drifts are widest at the outer periphery of the ring at which point the finest reduction takes place and that on this account the plate is not as liable to be worn or injured as in the ordinary construction of such plates. The reverse curve given to the drifts 3 and 5, at their outer extremity, causes the grain to be fed more slowly at the point where the finest reduction of the grain takes place. As the grain is fed through the spiral passages formed by the drifts 3 and 5, it comes into contact with the stop l() and the grain will pass in equal quantities on each side of said stop, and as the surface B is at an angle with the curved surface A and inclines slightly upwardly, the grain is gradually reduced finer and finer, and passes into the depressions 9. The larger particles will be held in these depressions and as the plate revolves they will feed up the inclined face of the depressions and be gradually crushed liner and finer, and as the height of the teeth and the space therebetween is the same from the outer ends of the groove 9 to the periphery of the plate, all the particles of the grain will be reduced to substantially the same state of fineness.

I wish to call especial attention to the novel construction and arrangement of the The stops 10 prevent the larger particles of the grain feeding too rapidly into thespiral passages formed by the drifts 3 and 5 and their angular shape renders them 'stronger and forms a better guide for the grain. The depressions 9 extend on the face B and form guides for the grain which is moving toward the periphery of the grinding plates so that the larger particles will enter the depressions 9 and be gradually reduced as they are fed toward the outer edge of the plate and each grinding tooth will do substantially the same amount of work.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is

l. In a grinding plate, main drifts spirally arranged on the working face but forming a reverse curve near the outer edge of the plate, shorter drifts intermediate said main drifts, and parallel therewith and extending to the periphery of the plate, and a series of short plate, shorter drifts intermediate said main drifts and parallel therewith and extending to the periphery of the plate, a series of short drifts at the outer edge of the plate and parallel,with the reverse curved portion of said main drifts and stops interposed about midway said intermediate and said main drifts.

8. In a grinding plate, main drifts spirally arranged on the working face but forming a reverse curve at the outer edge of the plate, intermediate drifts shorter than said main drifts and extending parallel therewith to the outer periphery ofthe plate and parallel with the reverse curved portions of said main drifts, and depressions between the drifts near the outer end thereof inclining inwardly and downwardly,

4. In a grinding plate, main drifts spirally arranged on the working face, intermediate drifts shorter than said main drifts and extending parallel therewith to the outer periphery of the plate, a series of short drifts at the outer edge of the plate parallel with the reverse curved portion of said intermediate and said main drifts, depressions between the drifts near the outer edge of the plate and inclining inwardly and downwardly and stops arranged about midway between said main and said intermediate drifts.

5. In a grinding plate, main drifts spirally arranged thereon but forming a reverse IOO curve near the outer edge thereof, interme diate drifts shorter than said main drifts, and extending parallel therewith to the outer periphery of the plate, a series of short drifts parallel with said main and said intermediate drifts and located near the outer edge of the plate, depressions between the drifts beginning near the outer edge of the plate and inclining inwardly and downwardly and angularly shaped stops radially disposed substantially midway between said main and said intermediate drifts.

6. In a grinding plate, main drifts spirally arranged thereon forming a reverse curve near the outer edge of the plate, intermediate drifts shorter than said main drifts and extending parallel therewith to the outer periphery of the plate, short drifts at the outer edge of the plate, parallel with said main drifts, depressions between the drifts at the outer edge of the plate, said depression inclining inwardly and downwardly and tapering from their central point toward their end, and an angular stop arranged about midway between said main and said intermediate drifts.

7. In a grinding plate, having a curved face A and face B angularly disposed thereto IIO ISO

and a raised face C, main drifts beginninfT at the inner edge of said face A and extending outwardly to the periphery of the plate but forming a reverse curve on the face C, intermediate drifts beginning at the inner edge of angular faee B and extending parallel with said main drifts to the periphery ofthe plate, short drifts arranged on the face C parallel with said main and said intermediate drifts, depressions between said drifts near the o'uter edge of the plate inclining inwardly and downwardly and vanishing in face B and angular stops radially disposed on the face B, substantially midway said main and said intermediate drifts.

8. In a grinding plate, having a curved face A and a face B angularly disposed thereto and a face C extending outwardly from face B, main drifts beginning at the lower edge of faee A and extending spirally on the face B and forming a reverse curve on the face C, intermediate drifts beginning at the inner edge of face B and extending parallel with said main drifts to the periphery of the plate, short drifts arranged on the face C parallel with said main and said intermediate drifts, each of said drifts on the face C having a substantially vertical cutting edge, a flat upper face and the side opposite said cutting face being inclined or beveled, depressions between the drifts near the outer edge of the plate and inclining inwardly and downwardly and vanishing in the face B, said depressions being widest near the inner ends of said short drifts and an angular stop radially disposed on the face B substantially midway said main and said intermediate drifts.

9. In a grinding plate, a dress consisting of series of drifts of three different lengths extending spirally outward to the periphery of the plate, so as to form grinding teeth at the outer edge thereof, said teeth having a substantially vertical cutting edge, a flat upper faee and a beveled or inclined rear face, a depression between said drifts at the outer edge of the plate inclining inwardly and downwardly and vanishing at a suitable point and an angular stop radially disposed substantially midway said main and intermediate drifts, adapted to regulate the feed of the grain to the shortest drifts.

10. In a grinding plate, a working face comprising a curved face A, a face B angularly disposed to the face A and inclining slightly upward and a raised face C extending outwardly from said face B, main drifts spirally arranged on faces A and B but forming a reverse curve on the face C, intermediate shorter drifts arranged on the faces B and C parallel with and substantially midway said main drifts, a series of short drifts arranged on the face C parallel with the outer ends of said main and intermediate drifts, depressions between said drifts at the outer edge of the plate inclining inwardly and downwardly, and vanishing in the face B at a suitable point, the inner ends of said short drifts inclining inwardly and downwardly and the inner ends of said main and intermediate drifts being substantially vertical, the upper face of all of said drifts lying in substantially the same plane, and a triangular stop'radially arranged at the inner' edge of the face B, substantially midway said main and said intermediate drifts and adapted to regulate the feed of the grain to said short drifts.

11. In a grinding plate, main drifts and drifts intermediate said main drifts, a series of shorter drifts and stops interposed between said intermediate and said main drifts.

12. In a grinding plate, main drifts and drifts intermediate said main drifts and shorter than the same, a series of short drifts and depressions extending below the base of the plate and between said short drifts adj acent the inner end thereof and extending inwardly therefrom.

13. In a grinding plate, main drifts, shorter drifts intermediate said main drifts, a series of short drifts, stops between said intermediate and said main drifts and depressions between said series of short drifts.

14. In a grinding plate, main drifts spirally arranged on the working face, shorter drifts intermediate said main drifts, and stops interposed between said intermediate and said main drifts.

15. In a grinding plate, main drifts spirally arranged on the working face, shorter drifts intermediate said main drifts, a series of short drifts intermediate said first drifts, and stops interposed between said intermediate and said main drifts.

16. In a grinding plate, main drifts spirally arranged on the working face, intermediate drifts shorter than said main drifts, and depressions between the drifts inclining inwardly and increasing in depth.

17. In a grinding plate, main drifts spirally arranged on the working face, intermediate drifts shorter than said main drifts, depressions between tlie drifts inclining inwardly and increasing in depth, and stops interposed between said intermediate and said main drifts.

VILLIAM J. BUSSINGER.

Vitnesses:

Wir. O. TnoxtrsoN, HENRY O. EVANS.

IOO 

